| (19) |
 |
|
(11) |
EP 0 632 147 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.07.1995 Bulletin 1995/28 |
| (43) |
Date of publication A2: |
|
04.01.1995 Bulletin 1995/01 |
| (22) |
Date of filing: 17.06.1994 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FR GB IT LI NL SE |
| (30) |
Priority: |
17.06.1993 IT MI931309
|
| (71) |
Applicant: MONTELL NORTH AMERICA INC. |
|
New Castle County
Delaware (US) |
|
| (72) |
Inventors: |
|
- Branchesi, Millo
I-05100 Terni (IT)
- Spagnoli, Leonardo
I-05100 Terni (IT)
- Braca, Giancarlo
I-05100 Terni (IT)
|
| (74) |
Representative: Zumstein, Fritz, Dr. et al |
|
Zumstein & Klingseisen
Patentanwälte
Bräuhausstrasse 4
D-80331 München
D-80331 München (DE) |
|
| |
|
| (54) |
Fibers suitable for the production of nonwoven fabrics having improved strength and
softness characteristics |
(57) Disclosed is a fiber for nonwoven fabrics having thermowelding strength equal to
or higher than 5 N and/or flexibility index greater than 800, comprising a polymer
material additivated with organic phosphites and/or phosphonites, HALS, and optionally
phenolic antioxidants, said polymer material being selected from:
1) isotactic propylene homopolymers having an isotactic index greater than 90;
2) random copolymers of propylene with ethylene and/or a C₄-C₈ α-olefin; and
3) blends of polymers (1) with copolymers (2) or blends of at least one of said homopolymers
and copolymers with heterophasic propylene polymers;
said fiber being obtained by a spinning process operating with a real or equivalent
output hole diameter of less than 0.5 mm and with a hole flow-rate ranging from 0.1
to 0.6 g/minute, at a spinning temperature ranging from 230°C to 320°C, using polymers
(1), or (2), or polymer blends (3), having MFR from 5 to 40 g/10 min, and in the absence
of a drawing step.